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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 865.7 | $ 832.2
Change in revenue | $ 33.5 |
Operating revenue | 4.00% |
Operating Segments | U.S. Information Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 306.9 | 310.1
Change in revenue | $ (3.2) |
Operating revenue | (1.00%) |
Operating Segments | U.S. Information Solutions | Online Information Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 219.7 | 225.2
Change in revenue | $ (5.5) |
Operating revenue | (2.00%) |
Operating Segments | U.S. Information Solutions | Mortgage Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 41.7 | 38.6
Change in revenue | $ 3.1 |
Operating revenue | 8.00% |
Operating Segments | U.S. Information Solutions | Financial Marketing Services |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 45.5 | 46.3
Change in revenue | $ (0.8) |
Operating revenue | (2.00%) |
Operating Segments | International |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 244.5 | 216.2
Change in revenue | $ 28.3 |
Operating revenue | 13.00% |
Operating Segments | International | Asia Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 82.4 | 72.0
Change in revenue | $ 10.4 |
Operating revenue | 14.00% |
Operating Segments | International | Europe |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 70.6 | 61.7
Change in revenue | $ 8.9 |
Operating revenue | 15.00% |
Operating Segments | International | Latin America |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 56.0 | 51.0
Change in revenue | $ 5.0 |
Operating revenue | 10.00% |
Operating Segments | International | Canada |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 35.5 | 31.5
Change in revenue | $ 4.0 |
Operating revenue | 13.00% |
Operating Segments | Workforce Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 211.1 | 200.0
Change in revenue | $ 11.1 |
Operating revenue | 6.00% |
Operating Segments | Workforce Solutions | Verification Services |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 128.4 | 115.1
Change in revenue | $ 13.3 |
Operating revenue | 12.00% |
Operating Segments | Workforce Solutions | Employer Services |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 82.7 | 84.9
Change in revenue | $ (2.2) |
Operating revenue | (3.00%) |
Operating Segments | Global Consumer Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Operating revenue | $ 103.2 | $ 105.9
Change in revenue | $ (2.7) |
Operating revenue | (3.00%) |

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